Roland (@DF3LZ) header
Roland (@DF3LZ) profile picture

Roland

@DF3LZ

Signals, signals and signals

 Hamburg, Germany
frequencymanager.de
Joined July 2017
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  • Followers5.7K
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Photo by Roland (@DF3LZ)Photo by Roland (@DF3LZ)Photo by Roland (@DF3LZ)Photo by Roland (@DF3LZ)Photo by Roland (@DF3LZ)Photo by Roland (@DF3LZ)Photo by Roland (@DF3LZ)Photo by Roland (@DF3LZ)Photo by Roland (@DF3LZ)Photo by Roland (@DF3LZ)
There is a new release of DecSat github.com/CasualArclamp/Dec… - now supports the amazing Airspy RX! Very good tool for picking over Ku / C band data downlinks ;-)
GitHub - CasualArclamp/DecSAT: DVB-S2/S2X receiver in Rust: ACM, GSE/IP de-encapsulation to PCAP,...

GitHub - CasualArclamp/DecSAT: DVB-S2/S2X receiver in Rust: ACM, GSE/IP de-encapsulation to PCAP,...

DVB-S2/S2X receiver in Rust: ACM, GSE/IP de-encapsulation to PCAP, MPEG-TS, and a modulator - for HackRF One or recorded IQ - CasualArclamp/DecSAT

github.com
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DecSAT: A DVB-S/S2/S2X Satellite Receiver with Blind Scanning for the HackRF One rtl-sdr.com/decsat-a-dvb-s-s…
Image from rtl-sdr.com (@rtlsdrblog)
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The same COMSEC preamble, with a 40-bit fixed block inside a 128-bit IV, shows up on STANAG-4285, MS-110A and STANAG-4539 HF links. Common COMSEC protocol? i56578-swl.blogspot.com/2026…
Image from Antonio (Tony) I56578 SWL 🇮🇹 (@i56578_swl)
Image from Antonio (Tony) I56578 SWL 🇮🇹 (@i56578_swl)
Image from Antonio (Tony) I56578 SWL 🇮🇹 (@i56578_swl)
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US Navy stations on MS-110A 600bps/L send short bursts, each opening with a “01” run and the same 32-bit word (0x0A6E14DC), then random-looking data. Encrypted traffic or fill? i56578-swl.blogspot.com/2026…
Image from Antonio (Tony) I56578 SWL 🇮🇹 (@i56578_swl)
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2026-10-04 The 🇷🇺 🛰 UmKA-1 is transmitting that very short, legendary signal from 69 years ago, as a sign of deep respect for the pioneers of space exploration and its great orbital "ancestor". 🚀 🌌 Happy World Space Week to all! 🚀🌌 The broadcast ends at midnight UTC.
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2026-10-04 09:54 UTC. Reception of the CW beacon from the newly deployed 🇩🇪 1P PocketCube 🛰️ ERMINAZ-2U on 435.900 MHz. Replay of recorded IQ with @airspy_com Mini and Yagi antenna in 🇬🇷. <CT> HI HI DE DP0PQA! <RN> @amsatdl
Image from Merkouris SV2HWM (@SV2HWM)
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What If Your ESP32 Could Become an SDR? ESP-SDR turns supported ESP32 boards into a small software-defined radio receiver. It gives you access to raw IQ samples from the Wi-Fi radio, letting you see the 2.4 GHz spectrum and waterfall in a browser. You can explore things like RF signals, spectrum analysis, IQ data and wireless interference without expensive SDR hardware. The ESP32-C5 is even interesting here because it can work in the 5 GHz band. A tiny development board suddenly becomes a great tool for learning RF and signal processing. Would you try SDR on an ESP32?
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perfect!
Image from Antonio (Tony) I56578 SWL 🇮🇹 (@i56578_swl)
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A signal that keeps circling back: alongside the Russian Navy's T-600/CIS-36-50 family, a new candidate at 11592.0 kHz (FSK 41.6 Bd/200 Hz) doesn't quite fit any known configuration: close enough to be a relative, different enough to stay unidentified.
Image from Antonio (Tony) I56578 SWL 🇮🇹 (@i56578_swl)
Image from Antonio (Tony) I56578 SWL 🇮🇹 (@i56578_swl)
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RST sported a new mode on S-band last night and having a go at recording to do some analysis later tonight. Its cyclostationary components are very strong and of great interest to my research. At over 750000km RST is about half way to the Earth-Sun L2 point.
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Follow-up: the signal's origin is now confirmed. More interesting though — the 75bps waveform (S-4415/MS-110A) itself turns out to re-inject its full preamble every 120s, a modification not in the base spec. i56578-swl.blogspot.com/2026…
Image from Antonio (Tony) I56578 SWL 🇮🇹 (@i56578_swl)
Image from Antonio (Tony) I56578 SWL 🇮🇹 (@i56578_swl)
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Roman Space Telescope (RST) S-band emission. Command echoes on the transponder are fairly loud. The signal appears to be LHCP.
Image from Scott Tilley 🇺🇦 🇨🇦 (@coastal8049)
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Cyprus HF traffic = DHFCS Akrotiri. That's the reflex attribution in utility monitoring community. But if, this time, it isn't Akrotiri at all? A post about a 75 bps STANAG-4415/MS-110A (not frequent) signal on 18503.0 kHz: i56578-swl.blogspot.com/2026…
Image from Antonio (Tony) I56578 SWL 🇮🇹 (@i56578_swl)
Image from Antonio (Tony) I56578 SWL 🇮🇹 (@i56578_swl)
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2026-08-25 09:47 UTC. Telemetry reception from the 🇨🇳 🛰 BY70-4 (aka BY-04 or 8104 Harbin MicroSat), launched this morning, on 437.443 MHz, in BPSK @ 9600 bd. All decoded frames were uploaded to the @SatNOGS db and the server at Harbin http://119.45.229.166/pages/contributor.html
Image from Merkouris SV2HWM (@SV2HWM)
Image from Merkouris SV2HWM (@SV2HWM)
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2026-08-25 11:43 UTC - Reception of Beethoven's 🎶 "Ode to Joy" from the 🇺🇸 🛰️ PADRE on 401.360 MHz, in NFM mode. Replay of recorded IQ with @airspy_com R2 and turnstile antenna + LNA/BPF in 🇬🇷. @ucbssl
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UK DHFCS 16289.5 kHz Follow-up: DRS GA-205 TDM Evidence and 1536-bit Frame Analysis 📡👇 i56578-swl.blogspot.com/2026…
Image from Antonio (Tony) I56578 SWL 🇮🇹 (@i56578_swl)
Image from Antonio (Tony) I56578 SWL 🇮🇹 (@i56578_swl)
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UK DHFCS 800Bd/800 critical FSK & STANAG-4285 transmissions. The analysis demonstrates that the DHFCS system employs a scalable Data Link framing protocol, capable of adapting to different physical layer standards operating on the same channel. i56578-swl.blogspot.com/2026…
Image from Antonio (Tony) I56578 SWL 🇮🇹 (@i56578_swl)
Image from Antonio (Tony) I56578 SWL 🇮🇹 (@i56578_swl)
Image from Antonio (Tony) I56578 SWL 🇮🇹 (@i56578_swl)
Image from Antonio (Tony) I56578 SWL 🇮🇹 (@i56578_swl)
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Today we tested our v-star antenna for the next fieldday in September. It is working very well.
Image from Roland (@DF3LZ)
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The control unit for the vacuum relays in the mast box
Image from Roland (@DF3LZ)
Image from Roland (@DF3LZ)
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New blog post: Tianwen-1 safe mode telemetry. Peter from @amsatdl noticed that a few days ago Tianwen-1 was transmitting in safe mode. Here I analyze the telemetry signal, which is only 32 baud (16 bits per second). destevez.net/2026/08/tianwen…
A screenshot of a GNU Radio GUI that shows the spectrum of the signal and a time domain plot of the demodulated symbols.

ALT A screenshot of a GNU Radio GUI that shows the spectrum of the signal and a time domain plot of the demodulated symbols.

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